Bach composed the cantata in Leipzig for the First Sunday after Easter, called Quasimodogeniti. He composed it in his second annual cycle, which consisted of chorale cantatas since the first Sunday after Trinity of 1724. Bach ended the sequence on Palm Sunday of 1725, this cantata is not a chorale cantata and the only cantata in the second cycle to begin with an extended sinfonia. The prescribed readings for the Sunday were from the First Epistle of John, "our faith is the victory", and from the Gospel of John, the appearance of Jesus to the Disciples, first without then with Thomas, in Jerusalem. The unknown poet included verse 19 from the Gospel to begin the cantata, later as movement 4 the first stanza of the chorale "Verzage nicht, o Häuflein klein" by, which had been attributed also to Johann Michael Altenburg, and as the closing chorale two stanzas which had appeared added to Martin Luther's "Erhalt uns, Herr, bei deinem Wort": "Verleih uns Frieden gnädiglich", Luther's German version of Da pacem Domine, and "Gib unsern Fürsten und all'r Obrigkeit", a stanza by Johann Walter paraphrasing , concluded with a final amen. Werner Neumann suggested that Bach himself may have been the anonymous poet, while Charles Sanford Terry proposed Christian Weiss. Bach scholar Alfred Dürr supposed that it is the same author who wrote Bleib bei uns, denn es will Abend werden, BWV 6, first performed six days earlier on Easter Monday of 1725. After the quote from the Gospel of John, the poet paraphrases, in movement 3, words of Jesus from the Gospel of Matthew,, "Wo zwei oder drei versammelt sind in meinem Namen, da bin ich mitten unter ihnen". Bach first performed the cantata on 8 April 1725, and again in Leipzig at least twice, on 1 April 1731 and either on 1 April 1742 or on 7 April 1743.
Possibly Bach took the opening sinfonia from earlier music. According to John Eliot Gardiner, this movement and the first aria are both taken from Bach's lost congratulatory cantata BWV 66a, celebrating the 24th birthday of Leopold, Prince of Anhalt-Köthen on 10 December 1718. Alfred Dürr believed that it is a movement from a concerto. It does not highlight a particular solo instrument. Rather it is a type of concerto grosso, the strings interacting with a concertino of the woodwinds, oboes and bassoon. The two groups first introduce their own lively themes, which are distinct but related to each other. Then they also exchange their themes and play together. The middle section begins with a surprising new motif for oboe and bassoon, which Bach himself marked "cantabile". The Bible quote is sung in recitative by the tenor as the Evangelist, accompanied by the continuo in repeated fast notes, possibly illustrating the anxious heart beat of the disciples, when Jesus appears, "On the evening, however, of the same Sabbath, when the disciples had gathered and the door was locked out of fear of the Jews, Jesus came and walked among them". In movement 3, an aria marked adagio, the repetition is kept in the bassoon, but the strings hold long chords and the oboes play extended melodic lines. According to Dürr, it may have been another movement from the same concerto that movement 1 relies on. Bach composed the chorale text of movement 4, "Do not despair, o little flock", as a duet, accompanied only by the continuo including bassoon. Fragments of the usual chorale theme, "Kommt her zu mir, spricht Gottes Sohn", can be detected occasionally. Terry interprets that the bassoon obbligato was intended to accompany a chorale melody which "never actually sounded", conveying the "hiddenness" of the church in the world. The bass prepares in a recitative, ending as an arioso, the last aria, which is accompanied by the divided violins and the continuo. The theme is again a contrast between the "Unruhe der Welt" and "Friede bei Jesus". While the instruments play in wild motion, the bass sings a calm expressive melody, only accenting the word "Verfolgung" by faster motion in long melismas. According to Mincham, this aria might go back to a different movement from the same concerto as the sinfonia. The chorale theme of Luther's chorale was published by Martin Luther in the Kirchē gesenge, mit vil schönen Psalmen unnd Melodey, and then in the Geistliche Lieder by Joseph Klug. The melody of the additional stanza was first published in Das christlich Kinderlied D. Martini Lutheri in Wittenberg, 1566. Bach set it for four parts.
